[clang] [Clang] Fix potential null pointer dereferences in Sema::AddInitializerToDecl (PR #94368)

[via cfe-commits]

smanna12 wrote:

>>That is interesting as it implies that the call to InitializationSequence::Perform() did indeed return a result that was valid but null. Would you be able to debug to find out where that null result is coming from? Perhaps here: clang/lib/Sema/SemaInit.cpp:

Thanks @tahonermann for reviews!. Yes, it is coming from InitializationSequence::Perform()  
``
// No steps means no initialization.
 7574   if (Steps.empty())
 7575     return ExprResult((Expr *)nullptr);
``

https://github.com/llvm/llvm-project/pull/94368